91 pitchers met the criteria as of August 12, 2018. Here are the ten best and ten worst: ...Among the ten best are Red Sox starters (7) Chris Sale and (9) David Price. The other two Red Sox starters: (28) Eduardo Rodriguez and (38) Rick Porcello. Among the ten worst are Yankees starters (84) CC Sabathia and (87) Masahiro Tanaka. The other two Yankees starters: (37) Sonny Gray and (71) Luis Severino.That suggests that the Red Sox do not need depth in the bullpen nearly as much as the Yankees. More on this in the next post.
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The Yankees recently acquired two starting pitchers. Both were ranked among the 91 in the previous post:

This post deals with the starters who have thrown at least 100 innings for the Red Sox or Yankees this season.

Rank among 91

37

71

84

87

OPS

OPS

OPS

OPS

PA

PA

PA

PA

Yankees

Gray

Severino

Sabathia

Tanaka

Gray

Severino

Sabathia

Tanaka

1st PA in G, as SP

.743

.608

.605

.638

189

216

198

171

2nd PA in G, as SP

.871

.523

.668

.626

183

216

196

169

3rd PA in G, as SP

.708

.872

.987

1.027

93

163

115

96

Rank among 91

7

9

28

38

OPS

OPS

OPS

OPS

PA

PA

PA

PA

Red Sox

Sale

Price

Rodriguez

Porcello

Sale

Price

Rodriguez

Porcello

1st PA in G, as SP

.505

.710

.641

.682

207

206

171

216

2nd PA in G, as SP

.502

.743

.667

.672

205

198

171

215

3rd PA in G, as SP

.594

.601

.684

.713

139

139

101

169

Tanaka was on the disabled list (DL), so his plate appearances (PA) by batters against him are low. Gray's low PA for "3rd PA in G, as SP" are low because his OPS for 2nd is so high that he gets removed.

Overall, the Red Sox top starters have piled up more PA and with lower OPS. Perhaps most alarming for the Yankees is that their ace, Severino, has such a high OPS for 3rd time through the order.

Obviously, not every starting pitcher has a lot of trouble 3rd time through the order, despite the hysteria we might hear from some media people.